You eat an apple 改為否定句是you are not eat an apple嗎改為否定句：You don't eat an apple 句子含有BE (am,is ,are)的句子,變否定為下面公式主語(yǔ)+be (am,is,are)+ not +表語(yǔ)（形容詞,名詞,介詞短語(yǔ),從句,非謂語(yǔ)...you are eating an apple是現(xiàn)在進(jìn)行時(shí)吧，這句話結(jié)構(gòu)也是主系表嗎還是主謂賓you are eating an apple是現(xiàn)在進(jìn)行時(shí)吧，這句話結(jié)構(gòu)也是主系表嗎還是主謂賓是主語(yǔ)，謂語(yǔ)，賓語(yǔ)結(jié)構(gòu)主語(yǔ): You 謂語(yǔ)：are eating 賓語(yǔ)：an apple